Cops are hunting for the thug shown here who gunned down a man in Flatbush.

The cold-blooded killing happened in front of a restaurant on Nostrand Avenue near Glenwood Road at about 7:40 p.m. this past Saturday.

The gun-toting killer can be seen walking into the restaurant and then walking out and turning around. He draws a large caliber handgun and fires into the chest of his victim, 24-year-old Trevonne Winn, and then runs away.

Winn, who moved to Brooklyn just weeks ago from South Carolina, died at Kings County Hospital.